Seem to have found a bottle of Dom Perignon champagne, 1970, while cleaning out an attic. This worth anything to anybody? I assume it's no longer drinkable, but the bottle and label are in good enough shape, and it's unopened.

I found one Ebay auction from a few years back for a 1970 Dom, seems to have gone for about $450 CDN. But there may very well be better places than Ebay to inquire about such things. Anybody know anything about such things?